CLUPET. Stand 373.

The Clews-Petersen Piston Ring and Engineering Co., Ltd., of West Heath Works, Mill Lane, West Hampstead, London, N.W. 6, show various examples of the Clupet double coil no-gap piston rings which are so valuable when, as is the case with a sporting car, it IS so vital that the last ounce of compression be retained. the peculiar feature of these rings, as can almost be gathered from the above description, is that instead of one coil of metal, there are two, and the ends of the ring sent into the central coil.